The Sprint launch of the iPhone 4 and iPhone 4S on their network brought record sales on the 1st day. Fared Adib, Sprint Product Chief had the following to say:

Sprint today reported its best ever day of sales in retail, web and telesales for a device family in Sprint history with the launch of iPhone 4S and iPhone 4. We reached this milestone at approximately noon CT/1pm ET. The response to this device by current and new customers has surpassed our expectations and validates our customers’ desire for a truly unlimited data pricing plan.

Although Sprint has unlimited data, speed is an issue. The network is not as fast as AT&T but when AT&T and Verizon folks run out of data Sprint customers will keep on downloading.